this is an amazingly complete game for such a short time. i really liked the whole unlocking abilities things, the level design was very sensible, and this is one of the most balanced game control in a game jam platformer i ever played (except for bouncing off walls which was pretty difficult ;) )
the music loop is very palatable and the art is very impressive for such a short time, although i'd suggest grouping the colors more so its easier to tell between the bg assets and the interactive parts.
overall great job! :)